Refrigeration apparatus



June 21, 1938;

O. PRICE REFRIGERATION APPARATUS Original Filed April 20, 1925 6 Sheets-Shee t "1 INVENTOR Us 502726 Pr z'c e,

BY I 6 ATTORNEY June 21, 1938. R E zmmw REFRIGERATION APPARATUS Original Filed April 20; 1925 6 Sheets-Sheet 2 IIII INVENTOR ATTORNI-IY June 21, 1938. 0, LPRICE 2,121,049

REFRIGERATION APPARATUS Original Filed'April 20, 1925 6 Sheets-Sheet 3 INVENTOR flsioz'zzel Bios;

ATTORN EY O. I. PRICE REFRIGERATION APPARATUS June 21, 1938.

6 Sheets-Sheet 4 Original Filed April 20, 1925 INVENTOR 0650mm Z Pfz'ce,

BY ATTORNEY 3 June 21, 1938. 0, R E 7 2,121,049

-' REFRIGERATION APPARATUS Original Filed April 20, 1925 6 Sheets-Sheet 5 INVENTOR 05502726 Z Bice,

ATTORNEY 7 June 21, 1938. o, PRICE 2,121,049

" REFRIGERATION APPARATUS Original Filed April 20, 1925 6 Sheets-Sheet 6 INVENTOR ATTORNEY Patented June 21, 1938 UNITED STATES REFRIGERATION APPARATUS Osborne 1. Price, Frederick, Md., asslgnor, by

mesne assignments, to General Motors Corporation, Dayton, Ohio, a corporation of Delaware 4 Original application April 20, .1925, Serial No.- I 24,599. Divided and this application March 31, 1031, Serial No. 528,724. Renewed. August 20,

This application-is a division of my copending application Serlal'No. 241699, filed April 20, 1925, for Refrigerating apparatus. Y

My invention relates broadly to refrigeration 5 machines, and more particularly to a simplified construction of refrigeration apparatus having parts arranged for manufacturing inexpensively on a quantity production basis. One oi the objects of my inventionis to prowide an apparatus for a refrigeration system which may be constructed in different capacities for household and domestic use, or for commercial refrigeration systeins of larger size, the general arrangement of parts for the various capacity machines varying for the installation [of-different capacity.

Another object of my invention is toprovide a construction of refrigeration apparatus which been a source of danger by the injury of food products in domestic systems.-

Still another object of my invention is'to provide a construction of refrigeration apparatus in which all the moving parts are disposed with-- in separate containers joined to form housings 1for the apparatus which may be conveniently mounted with respect to the usual ice box in the home and connected with cooling means within the ice box, for maintaining thefoodstuffs at a constant cold temperature. Another object of my invention is to provide a construction of refrigeration apparatus where the danger ofleakage of the refrigerant is eliminated by dispensing with conventional stuiling box connections or packing between the high and low pressure portions of the apparatus and providing continuous passages interconnecting the several portions in such manner that the passage of the refrigerant is constantly confined. Another object of my invention is to provide a construction of refrigeration apparatus wherein the parts may be readily cast to form a rugged unit including a low pressure compartment which comprises the housing of the driving motor, and a high pressure compartment in which is situated a pump or compressing mechanism driven by the said motor with the parts so arranged that leakage of the refrigerant between the diflerent portions of the apparatus is substantially eliminated.

Still another object of my invention is to pro- 5 vide a construction of self-lubricating refrigerato the accompanying drawings, in which:

I 11 Ciai ns. (of. 230-139) tion apparatus whereby lubricant is forced through the apparatus in a continuous cycle during the running period, by the operation of the moving parts.

My invention further resides in the construc- 5 tionfand assembly of a compressor and driver for refrigeration systems arranged to occupy a relatively small physical area and having high and low pressure compartments with a driving mechanism forming part of one of the compartments and a compressing mechanism in the other of the compartments, the compressing mechanism being arranaged to deliver the refrigerant under pressure into the last mentioned compartment with means for cooling the refrigerant and delivering the same to the freezing system.

i The construction of the apparatus of my invention will be more clearly understood from the specification hereinafter following by reference tus which forms the upper compartment of the' refrigeration apparatus illustrated in Fig. 3; 35

. Fig.5 is a cross-sectional view taken on line 8-4 through the lower compartment of the re frigeration apparatus illustrated in Fig. 8:

Fig. 6 is a cross-sectional view taken on line O8 of Fig. 3 through one of the stages of thecompressing mechanism employed in the retr eeration system: a

Fig. 7 is a detailed cross secticnal view. illustrating the arrangement oi the intake and outlet ports in the driving apparatus;

Fig. 8 is a cross-sectional view through the exhaust port taken on line 0-4 of Fig. '2;

Fig. 9 is a view showing an air cooled machine constructed in accordance with my invention; and Fig. 10 is a view, partly in elevation and partly in section, of the machine shown in Fig. 9 showing details thereof.

Referring to the drawings in detail the refrigeration apparatus comprises a unit designated by reference character I which may be located in any convenient place with reference to a cabinet refrigerator 2. The refrigeration apparatus -includes a driving mechanism and a compressing posed within a portion of a condenser compartment formed by the closure member 4 formed on the upper and lower sides of a central main supporting frame 20. The refrigeration apparatus may be either water cooled or air cooled but in Fig. 1, I have shown the system through a connection 5 leading to a condenser shown more clearly in Fig. 3 by reference character 8, the cooling water passing from the condenser coils 8 and into connection 3 from which it is led to water jacket III which surrounds the compartment 3 formed by the driving apparatus. The waste water is delivered through connection -ll. A pipe line l2 conducts the refrigerant through the upper cover or closure member i4 of the com-- partment 3 formed by the driving mechanism. Liquid refrigerant is delivered by the refrigeration apparatus to a pipe line l5 as will be more fully hereinafter described to the cooling system mounted within the refrigerator 2. Liquid refrigerant is maintained at a predetermined level in tank I6 by any suitable float valve control mechanism l1 and is supplied through a pipe line l8 to the evaporator cooling system or boiler l9. Heat is absorbed by the liquid refrigerant in the evaporator absorber or cooling tank l9 from food products or other contents within the chest of th refrigerator 2 and the refrigerant returned as a gas through pipe line l2 to the refrigeration apparatus. All pipe line connections in the apparatus are well packed as indicated at 5a, 9a, 91).

Ha and l2a to insure against leakage.

Referring more particularly to Fig. 3 of the drawings it will be observed that conventional stufiing boxes as heretofore required in refrigeration machines, have been eliminated in my design of refrigeration apparatus together with all the inherent disadvantages of such stufllng boxes. In eliminating the stufling boxes from the refrigeration apparatus I provide a central main supporting frame or 'casting 20 formed along a longitudinally extending vertical axis and having an upper bell which forms with the field and armature of the motor comprising the drivlng mechanism, a gas tight compartment on the upper side of the main supporting frame closed by the cover H which is suitably secured or sealed against the upper part of compartment 3 with a suitable gasket 23 between the annular flanges 2i and 22. The driving mechanism forms a part of the compartment inasmuch as the armature 24 and field 25 are subjected at all times to the gaseous refrigerant which may pass from the line l2 through the space intermediate the armature and the field and through the space between the frame of the driving mechanism and the inside walls of the compartment as provided by the inwardly directed longitudinal extending ribs 25. The ribs 26 center the field of the motor within the compartment. By this arrangement the gaseous refrigerant passes from the line l2 in a downward direction through the annular gap 21- and the ports 28.

The casting 20 is provided with a downwardly extending end bell 29. The extended casting 29 has the compressing mechanism mounted on the lower end thereof. The compressing mechanism may consist of one or more stages. I have illustrated a compressor having a pair of compressor members 30 and Si actuated by the extended shaft 32 which is directly connected with the armature 24 of the driving mechanism. The shaft 32 carries eccentrics 33 and 34 disposed at degrees with respect to each other and mount ed within each of the compressor members 30 and 3| in such manner that upon rotation of the extended shaft 32 an oscillatory or partially reciprocal motion is imparted to the compressor members 30 and 3|. The compressor members 30 and 3| are mounted within chambers 35 and 35 spaced by the separator 31. The chamber 35 is mounted directly adjacent the end of the bell 29 while the lower extremity of chamber 36 is closed by the end plate 38.

The. long extended casting which comprises the bell 29 serves as means for securing an oil seal for separating the high and low pressure areas of the refrigeration apparatus. The extended shaft 32 is journaled'in bearings 39 and 40 at opposite ends of the extended casting 29. There is a slight clearance along the entire length of the shaft 32 between the walls of the extended bore 4| in the casting 29, which allows oil or lubricant to pass along the shaft 32 providing both automatic lubrication for the refrigeration apparatus and establishing an oil seal or an automatic stuffing'box between the high and low pressure sides of the system as will be more fully pointed out hereinafter. The extended casting 29 is formed with a web portion 42 (Fig. 5) interconnecting the bore portion 4! in which shaft 32 is journalled and a portion 43 in which is integrally cast the extended ports 44 and 45 being the suction fro m the motor compartment and the discharge to the condenser compartment respectiveiy. By the provision of the integrally cast suction and discharge passages in the casting 23 I eliminate the many disadvantages accruing from the use ,pf pipe 'iines and the packed joints in the suction and discharge passages which have heretofore been necessary in refrigeration apparatus. The suction passage 44 leads to each of the compression chambers 35 and .35 for conducting gaseous refrigerant through the entrances 46 and 41 shown more clearly in Fig. 7 to the compressor members 30 and 3!. The compressor members 30 and 3! by virtue of the motion imparted to them by rotation of the eccentrics 33 and 34 on the shaft 32 are moved upon members 48 which rock in the side walls of the chambers 35 and 36 as represented at 49. As shown more clearly in Fig. 6 the members 43 comprise vanes having a portion which extends into a slot 50 formed in the compressor members. The compressor members 30 and 3| while free to oscillate and to have partial rotation or reciprocal motion do not rotate but serve to compress the gaseous refrigerant to a pressure cor responding to the temperature of liquefaction.

With my compressor in operation I have successfully obtained and maintained pressures equal to 175 pounds gauge per square inch, equivalent to pounds absolute pressure without reaching the limits of the compressing mechanism. While these pressures were being maintained I secured on the suction side a vacuum pressure corresponding approximately to 28 inches of mercury. In each of the chambers 35 and 36 I provide a spring-pressed valve 5i interposed in each of the discharge ports 54 and 53 which operate to close the passages 54 and 53 intermediate the compression strokes of the compressor members 30 and 3|. It will be observed that the ports in each of the chambers 35 and 36 and separator plate 31 are aligned with the suc-- tion and discharge ports in the casting 29. The

refrigerant compressed to a pressure equivalent to liquefaction is conducted along the port or passage 45 and discharged into the compartment 4 at a point adjacent the lower wall of the low pressure compartment as represented by the dis- It will be noted that the refrigerant is discharged at a point within the screen so that oil or lubricant exhausted by the compressor will be caught in a, him on this screen where it trickles down the sides of the screen to the oil level 61 within the container 4. In order to insure against the passage of oil or lubricant into the refrigeration system I place an additional screen 59 about the end of the gravity oil separator 60 which extends into the compartment 4. It will be observed that the inwardly projecting end of the gravity oil separator i is disposed at an angle 6! with respect to the vertical in such manner that oil which is caught on the screen 59 tends to trickle off and discharge into the oil reservoir in the'lower part of the compartment 4 The screen 56 is suitably apertured about-thebase thereof as represented at 62 to permit the passage-of oil freely along the bottom of the compartment 4. This arrangement enables me to provide automatic and self-lubrication for the refrigeration apparatus. The compartment 4 is under high pressure during the operation of the refrigeration apparatus. The motor housing is in a condition of low pressure. There is a normal tendency, therefore, for the pressure in compartment 4 to exert such effect upon lubricant in the lower part of compartment 4 that the lubricant is forced upwardly through apertured member 63 and along the sleeve bearing 4i progressively feeding into the low pressure motor housing. In this manner both bearings 39 and 40 are continuously lubricated. The lubricant which is forced into the low pressure motor housing returns along the suction passageway 44 and automatically 'lubricates the compressor mechanism in its entirety. As heretofore explained. oil which may be discharged by the compressing mechanism is not carried along with the refrigerant but is extracted therefrom by the screening means 56, 59 and the gravity oil separator 60. The compartment 4 is continuously cooled by means of the cooling coils 8 and the refrigerant liquefied. The refrigerant seeks a level approximately as represented at line -5 in Fig. 3. The refrigerant is forced under pressure through the gravity oil separator 60 wherein the tendency of any oil which may by chance have been carried along with the refrigerant is to return to the lower part of the compartment 4.

As heretofore explained the refrigerant in the form of a liquid passes along the supply line H to be usefully employed for the extraction of heat and is returned to the low pressure motor housing through pipe line I! for a repetition of the cycle.

It is to be understood that the apparatus of my invention may employ various kinds of refrigerants such as ethyl chloride, methyl chloride, sulphur dioxide, carbon dioxide and others. I have used with marked success, however, the refrigerant ethyl chloride and have obtained temperatures as low as F. below zero.

By my arrangement of refrigeration apparatus wherein the refrigerant actually passes through the moving parts of the driving mechanism, the driving motor is maintained at a desirably low temperature even under conditions of use over extended periods of time. In the event that liquid refrigerant should be returned through the suction line 12, the refrigerant will be subjected to the mild temperature or heat of the motor armature 24 which will at once convert the liquid refrigerant into a gas and facilitate the elimination of liquid refrigerant from the compressing mechanism. The expansion of the liquid refrigerant into a gas in direct contact with the motor winding further reduces the temperatures at which the motor operates.

Connections for the driving motor are brought out through leads 84 through any convenient part oi the frame of the apparatus. I have shown terminal posts 65 provided-for connecting the driving motor to the power supply system. While I have not illustrated any electrical control circuits for the driving mechanism I desire that it be understood that any suitable method of automatic control'and regulation of the motor circuit and also the water supply system may be employed. That is to say, the motor may be operated and water supplied to the cooling system only during periods that temperature conditions actually demand the supply of refrigerant to the cooling or expansion tank 09.

I have illustrated the water cooled refrigeration system in the drawings, but it will be understood that my invention is equally applicable to an air cooled system as represented in Figs. 9 and 10. In this construction the upper bell 3 is ribbed as represented at 65. ing t encloses the depending casting 29.. The discharge port 45 instead of exhausting at a point directly within the chamber 4 is connected to an external cooling coil 66 disposed about the out- The lower cas-.

side walls of the chamber 4, from which coil it exhausts to the interior of the chamber 4 at a point represented at 61. l

The gaseous or liquefied refrigerant is conducted through the gravity oil separator 60 as heretofore explained. Screen 66 may be omitted. but preferably is retained to form a quiescent oil pocket around apertured member 53. The re: frigerant passes through an auxiliary coil 68 before reaching the line iii. The purposeof the.

addition of the auxiliary coil is to more fully insure the cooling or liquefaction of the refrigerant by the cooling action of air or otherwise.

The refrigerant is compressed by the compresso! as heretofore described in the water cooler modification. The compressed refrigerant leaves through the discharge directly to an external cooling coil 66 where the refrigerant is cooled or condensed and discharged into the interior cha'mber 4 at 6T. The'refrigerant and the lubricant separate in the chamber 4 so that the lubricant may be re-circulated through the moving parts of the compressor unit. the lubricant passing through the apertured member 63 to these moving parts. The refrigerant passes through the gravity oil separator to the auxiliary coil 68 where the refrigerant is further cooled or condensed and from which it is discharged through the line i5 to the tank IS in a manner similar to that shown in Fig. 1, from whence the refrigerant passes through the float control valve, i1 through the pipe line is to the evaporator cooling system or boiler it. From thence the evaporated refrigerant returns to the unit through the pipe line II.

The fan 10 for aiding in the cooling action may be driven by a motor separate from'that which is sealed inside of the unit I.

It will be observed that the lubricant is forced in a continuous cycle in a direction up to shaft 32, thence down the suction lineand finally in spray with the refrigerantunder pressure. As heretofore explained this method of lubrication insures long life to the apparatus. It will be observed that the compressor is normally submerged or partially submerged in the lubricant and due to the pressure in the condensing chamher there is a constant tendency for the lubricant to be forced upwardly around shaft 82. Furthermore due to the fact that high pressure exists about the compressing mechanism, there is no tendency for outward leakage to take place from the compressor and gaskets therefore become unnecessary. The advantages of passing the refrigerant through the moving parts of the driving mechanism have already pointed out. It will be understood that the windings for the motor are carefullyprotected to resist chemical action of the refrigerant.v The insulation on the conductors forming the motor windings is impregnated with suitable insulation material and the windings may be soaked in bakelite or other chemical and electrical resistant material. I; bore. a motor rotor secured to said shaft at the have successively operated the motor over long periods in the presence of the refrigeration gases without detriment to the moving parts. The

-mounting of the motor on a bearing which is wholly below the driving parts enables the motorto be continuously lubricated which would not be possible in the event that a top bearing was provided.

While I have described my invention in certain particular embodiments, I desire that it be un--:

derstood that modifications may be made and that I intend no limitations upon the invention other than those imposed by the scope of the appended claims.

' I claim:

1. In a motor compressor unit, the combination of a motor, a compressor. a main frame upon opposite sides of which said motor and compressor are directly mounted, shaft means pro-v viding a direct drive connection between said motor and said compressor, and closure members for said motor and compressorjeach removably secured and sealed to said main frame; said compressor, motor and shaft means being entirely supported on said frame independently of said closure members when said closure members are secured and sealed to the frame; and a gas conduittfor said compressor passing through said main frame independently of said closure members, whereby the closure members may be removed and replaced without disturbing the shaft counterbalancing said eccentric located outside of the zone between said end plates.

3. A motor-compressor unit comprising a main frame member having a vertical axial bore and a plane surface at the lower end thereof, a shaft rotatably mounted within said bore, a motor stator mounted on said main frame member at the upper end of said bore and coaxial with said bore, a motor rotor secured to said shaft at the upper end of said bore, a cylinder block secured to said surface and having an internal cylindrical surface coaxial with said bore, an eccentric on said shaft within said cylinder, an annular piston block on said eccentric and having coaxial inner and outer vertical walls and plane parallel end walls, an end plate secured to said cylinder block, closure members sealing said motor-compressor unit and containing a body of lubricant adjacent to said compressor, said end plate having an opening for the flow of lubricant from said main body to the space between said eccentric and piston block and to the space between said bore I and said shaft and means causing flow of lubricant therethrough.

4. A motor-compressor unit comprising a main frame member having a vertical axial bore and a plane surface at the lower end thereof, a shaft rotatably mounted within said bore, a motorstator mounted on said main frame member at the upper end of said bore and coaxial with said upper end of said bore, a cylinder block secured to said surface and having an internal cylindrical surface coaxial with said bore, an eccentric on said shaft within said cylinder, an annular piston block on said eccentric and having coaxial inner and outer vertical walls and plane parallel and walls, one of said blocks having a vertical parallel walled slot and a divider blade slldably mounted therein, an end plate secured to said cylinder block, closure members sealing said nc-'- tor-compressor unit and containing a body of lubricant adjacent to said compressor, said end plate having an opening for the flow of lubricant from said main body to the space between said eccentric and piston block and to the space between said bore and said shaft and means causing flow of lubricant therethrough.

5. A motor-compressor unit comprising a main frame member having a vertical axial bore, a plane surface at the lower end thereof and a cup-shaped recess at the upper end thereof, a

shaft rotatably mounted within said bore, a motor stator mounted on said main frame member at the upper end of said bore, coaxial with said bore and with its outer walls engaging said recess, a motor rotor secured to said shaft at the upper end of said bore, a cylinder block secured to said surface and having an internal cylindrical surface coaxial with said bore, an eccentric on said shaft within said cylinder, an annular piston block on said eccentric and having coaxial inner and outer vertical walls and plane parallel end walls, an end plate secured to said cylinder block, closure members sealing said motor-compresscr unit and containing a body of lubricant adjacent to said compressor, said end plate having an opening for the flow of lubricant from said main body to the space between said eccentric and piston block and to the space between said bore and said shaft and means causing flow of lubricant therethrough.

6. A motor-compressor unit comprising a main frame member having a vertical axial bore and a plane surface at the lower end thereof, a shaft g 20 tween said eccentric and pistonblock-and to the rotatably mounted within said bore, a motor stator mounted on said main frame member at the upper end of said bore and coaxial with said bore, a motor rotor secured to said shaft at the upper end of said bore, a cylinder block secured to said surface and having an internal cylindrical surface coaxial with said bore, an eccentric on said shaft within said cylinder, an annular piston block on said eccentric and having coaxial inner and outer vertical walls and plane parallel end walls, one of said blocks having a vertical parallel walled slot and a divider blade slidably mounted therein, an end plate secured to said cylinder block, an inlet opening and an outletopening for compressible fluid on opposite sides of said divider blade, closure members sealing said motor-compressor unit and containing a body of lubricant adjacent to said compressor. said end plate having an opening for the flow of lubricant from said main body to the space bespace between said bore and said shaft and means causing flow of lubricant therethrough.

7. A motor-compressor unit comprising a main frame member having a shaft bore therethrough, a shaft in said bore, a motor rotor on one end of said shaft, a compressor on the other end of said shaft. 9. motor stator adjacent to said motor rotor and secured to said main frame member, and endclosure members each being removably se- 7 cured and sealed to said main frame member. said shaft, motor rotor, motor stator and compressor .belng operably mounted on saidmain frame entirely independent of said .clmure members. whether the said closure members are secured to or removed from the frame, whereby the unit may be operated for test before sealing.

8.'A motor-compressor unit comprising a motor; a casing containing a body of lubricant under compressor discharge pressure and having a frame provided with a shaft bore and providd with means forming a plane frame surface perpendicular to saidshaft b018,! compressor cylinder block having an internal cylindrical surface and first and'second plane and surfaces per-'- pendicular to said cylindrical surface, said cylinder block being secured to said frame with said first end surface againstsaid plane frame surface and with its internal cylindrical surface coaxial with said bore; a shaft in saidbore driven by said motor and having an. eccentric with an outer cylindrical eccentric surface; an annular piston block within said compressor cylinder block, said piston block mounted on said eccentric and haying coaxial inner and outer cylindrical walls and first and second plane parallel end walls, the

, inner of'said cylindrical walls of said piston block being in sliding engagement with the outer cylindrical surface of said eccentric, and said first plane parallel end wall of said piston bloclg being in sliding engagement with said plane surface of said frame; an end plate having a plane surface- "secured to said cylinder block with said last named surface being in stationary sealing contact with said second plane end surface of said cylinder and in sliding contact withsaid second plane parallel end wall of said'plston block; one of said blocks being provided with a fixed parallel walled slot and a divider blade slidably mounted in said slot and having a sealing engagement with the other of said blocks; means providing a lubricant flow from said. body of lubricant to relatively moving parts of said unit, and means providing gas intake and discharge passages to said compressor cylinder block.

9. A motor compressor unit comprising a.

motor: a casing containing a body of lubricant under compressor discharge pressure and having a frame provided with a shaft bore and provided with means forming a'plane frame surface perpendicula'r to saidshaft bore, a compressor cylinder block having an internal cylindrical surface and first and second plane end surfaces-perpendicular to said cylindrical surface, said cylinder block being secured to said frame with said first end surface against said plane frame surface and with its internal cylindrical surface coaxial with g D said bore; a shaft insaid bore driven by said motor and having an eccentric with an outer cylindrical eccentric surface; an annular piston secured to said cylinder block with. said lastnamed surface being instationary sealing contact with said second plane end surface of said'cylinder and in sliding contact with said second plane parallel end wall of said piston block; one of said blocks being provided with a fixed parallel walled slot and adivider blade slidably mounted in said slot and having a sealing engagement with the other of said blocks; means providing a lubricant 'flow from said body of lubricant to relatively moving parts of said unit, and means providing gas intake and discharge passages to said com- ;fpressor cylinder block, said shaft bore being vertical, said motor being at the upper end of saidv shaft bore and said compressor cylinderbeing fat the lower end of said shaft bore. a

10. A motor-compressor unit comprising a incframe :provided with a shaft bore andprovided with means forming a plane, frame surface per-r 1 pendicular to said shaft bore, a compressor cylinder block havingan' internal cylindrical surface and first and second plane end surfaces perpendicular to said cylindrical surface,.said cylinder block being secured to said frame with said first tor; a casing containing a body of lubricant nnder compressor discharge pressure and having a end surface against said plane frame surface and with its internal cylindrical sin-race coaxial with said bore; a shaft in said bore driven by said motor and having an eccentric with arr-outer cylindrical .,eccentric surface; an annular piston block within said compressor cylinder block, said piston block mounted on said eccentric and having coaxial inner and outer cylindrical walls and first and second plane parallel and walls, the inner of said cylindrical walls of said piston blockbeing in sliding engagement with the outer cylindrical surface of said eccentric, and said first plane parallel end wall of said piston block being in sliding engagement with said plane surface of said frame; an end plate having a plane surface secured to said cylinder block with said last named surface being in stationary sealing contact with said second plane end surface of said cylinder and in sliding contact with said second plane parallel end wall of said piston block; one

of said blocks being provided with a fixed parallel walled slot and a divider blade slidably mounted in said slot and having a sealing engagement with the other of said blocks; means providing a lubricant fiow from said body of lubricant to relatively moving parts of said unit, and means providing gas intake and discharge passages to said compressor cylinder block, said shaft bore being vertical, said motor being at the upper end of said shaft bore and said compressor cylinder being at the lower end of said shaft bore, said body of lubricant being at the lower end of said casing and said lubricant flow being upwardly from said compressor cylinder block along said shaft to said motor and from said motor downwardly back to said compressor cylinder block.

11. A motor-compressor unit comprising a motor; a casing containing a body of lubricant under compressor discharge pressure and having a frame provided with a shaft bore and pr0- vided with means forming a plane frame surface perpendicular to said shaft bore, a compressor cylinder block having an internal cylindrical surface and first and second plane end surfaces perpendicular to said cylindrical surface, said cylinder block being secured to said frame with said first end surface against said plane frame surface and with its internal cylindrical surface coaxial with said bore; a shaft in said bore driven by said motor and having an eccentric with an outer cylindrical eccentric surface; an annular piston block within said compressor cylinder block, said piston bloc mounted on said eccentrio and having coaxial inner and outer cylindricai walls and first and'second plane parallel end walls, the inner of said cylindrical walls of said piston block being in sliding engagement with the outer cylindrical surface of said eccentric, and said first plane parallel end wall of said piston block being in sliding engagement with said plane surface of said frame; an end plate having a plane surface secured to said cylinder block with said last named surface being in stationary sealing contact with said second plane end surface of said cylinder and in sliding contact with said ,second plane parallel end wall of said piston block; one of said blocks being provided with a fixed parallel walled slot and a divider blade slidably mounted in, said slot and having a sealing engagement with the other of said blocks means providing a lubricant flow from said body of lubricant to relatively moving parts of said unit, and means providing gas intake and discharge passages to said compressor cylinder block, said shaft bore being vertical, said motor being at the upper end of said shaft bore and said compressor cylinder being at the lower end of said shaft here, said motor having a stator concentric to said shaft bore.

OSBORNE I. PRICE. 

